The problem I have with replacement theology is the concept that Israel exists now according to the will of man, not of God. That contradicts God's word.
It actually doesn't contradict scripture at all. It wasn't God's will that Israel be like the other nations, but they demanded a king. So he gave them what they wanted, but said that their lust for a nation like all other nations was a rejection of his kingdom.
Then all the elders of Israel gathered themselves together, and came to Samuel unto Ramah, And said unto him, Behold, thou art old, and thy sons walk not in thy ways: now make us a king to judge us like all the nations. But the thing displeased Samuel, when they said, Give us a king to judge us. And Samuel prayed unto the LORD. And the LORD said unto Samuel, Hearken unto the voice of the people in all that they say unto thee: for they have not rejected thee, but they have rejected me, that I should not reign over them. 1 Samuel 8:4-7
That was a shadow pointing to the Jewish leaders' rejection of Christ and his kingdom because they wanted an earthly nation rather than the truth.
Then gathered the chief priests and the Pharisees a council, and said, What do we? for this man doeth many miracles. If we let him thus alone, all men will believe on him: and the Romans shall come and take away both our place and nation. And one of them, named Caiaphas, being the high priest that same year, said unto them, Ye know nothing at all, Nor consider that it is expedient for us, that one man should die for the people, and that the whole nation perish not. John 11:47-50
You and others who are so obsessed with an earthly nation are following in their footsteps